两个观察员看到了一束光的爆发：他们一个静止在平台上，还有一个在火车上移动。

A burst of light is seen by two observers: one stationary on a platform, the other moving in a train.

youdao

就像集中焦点的一束光那样思考。

That's like using the mind like a concentrated beam of light.

youdao

真的很简单。 我能看到这束光。

Okay.This is really easy.I can look at the light.

youdao

And one thing that Einstein put forth is he figured if well, what we're saying is that light is, in fact, a stream of particles, each one of those particles or photons must, therefore, have a momentum.

爱因斯坦提出了一件事情,他指出如果我们所说的光，事实上是一束粒子，那么这些粒子或者光子中的，每一个都有动量。

麻省理工公开课 - 化学原理课程节选

There is no way that you could irradiate a crystal of nickel with a single beam of x-rays and get that circular ring pattern if the electron beam were behaving as a particle beam only.

没有什么其他的途径,可以让镍晶体发射,单束X光来,继而得到环状图案,如果电子束,是以粒子束形式出现的。

麻省理工公开课 - 固态化学导论课程节选